Voio (, Vóio; - Boeon) is a mountain range in the southwestern Kastoria and western Kozani regional units in Greece. The mountain is part of the Pindus mountains. Its highest elevation is 1,805 m. It is a densely forested and sparsely populated mountain range. It is drained towards the river Sarantaporos in the west and towards the Aliakmonas in the east. The nearest mountain ranges are Gramos to the west and Smolikas to the southwest.